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    STP1598

    Low Cycle Fatigue of Cast Austenitic Steel

    Published: 0


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    Abstract

    Cast austenitic stainless steel 1.4848 is used to manufacture automotive exhaust system components. Low cycle fatigue (LCF) of 1.4848 austenitic steel was investigated through strain controlled fatigue testing at strain rates of 0.02/s, 0.002/s, and 0.0002/s in the temperature range from room temperature (RT) to 900°C. Its cyclic behavior was characterized in relation to deformation mechanisms. At RT, the material behavior was rate independent and cyclically stable, which occurred by plasticity. The material exhibited significant cyclic hardening at intermediate temperatures, 400°C to 600°C, with negative strain-rate sensitivity. In this temperature range, dynamic strain aging (DSA) presumably occurred due to slip dragging solute atoms. At high temperatures, 800°C and 900°C, the material exhibited positive rate dependence in the hysteresis behavior, and the cyclic stress response tended to stabilize with increasing cycles. The high temperature behavior was presumably controlled by a combination of plasticity and dislocation-glide creep. The integrated creep-fatigue theory (ICFT) was used to describe the deformation and life behaviors based on the identified mechanisms, which were corroborated by fractographic observations.

    Keywords:

    low cycle fatigue, austenitic stainless steel, damage mechanism, damage modeling, life prediction


    Author Information:

    Wu, Xijia
    National Research Council Canada, Ottawa, Ontario

    Quan, Guangchun
    Tenneco Automotive Operating Co., Inc., Grass Lake, MI

    Sloss, Clayton
    Wescast Industries Inc., Brantford, Ontario


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP159820160030